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Full-Text Articles in Earth Sciences
Reexamination Of Ore-Forming Processes In The Emery Mining District, Powell Co., Montana, Jarred Zimmerman
Reexamination Of Ore-Forming Processes In The Emery Mining District, Powell Co., Montana, Jarred Zimmerman
Graduate Theses & Non-Theses
The present investigation was undertaken in collaboration with the Montana Bureau of Mines and Geology to re-evaluate the Emery district using modern methods of ore deposit study including fluid inclusions, stable isotopes, and mineral geochemistry. Results from this thesis will be an aid in reassessing the potential of the Boulder Batholith and surrounding geologic units to host large, undiscovered precious and/or base metal deposits. The Emery (aka Zosell) district was mined from the late 1800s until the early 1950s. Mineralized quartz veins are hosted by basaltic andesite flows of the late Cretaceous Elkhorn Mountain Volcanics (EMV). Two sets of veins …
Stable Isotopes Of Hydrothermal Carbonate Minerals In The Butte Porphyry-Lode Deposits, Montana, Ryan Stevenson
Stable Isotopes Of Hydrothermal Carbonate Minerals In The Butte Porphyry-Lode Deposits, Montana, Ryan Stevenson
Graduate Theses & Non-Theses
The stable isotopic compositions of over 90 hydrothermal carbonate minerals in the Butte porphyry-lode system were analyzed. These samples came from the underground workings as well as the active Continental Pit area. Most material came from polymetallic “Main Stage” veins which post-date the porphyry Cu-Mo mineralization of Butte. Some samples from late calcite-stellerite veins were also included in the study. Rhodochrosite d13C and d18O values range from -8.3 to -2.9‰ (average of -6.7±1.0‰) and -1.8 to 12.8‰ (average of 3.6 ±3.4‰) respectively, while calcite d13C and d18O values range from -9.0 to …